Kopia

Kopia is a fast, secure, and open-source backup and restore tool designed to help users and administrators protect important data by creating encrypted, deduplicated snapshots and storing them in a range of local, network, or cloud storage locations. Instead of imaging entire machines, it focuses on backing up selected files and directories with efficient incremental backups that only transfer changed data, which reduces storage and bandwidth needs. Kopia has both a command-line interface for automation and scripting as well as a graphical UI for interactive use, making it suitable for advanced users and those who prefer visual tools. Its architecture supports end-to-end encryption, optional compression, and deduplication, so multiple backups can share data efficiently, and repositories can be stored securely even in untrusted locations.